EP2138598B1 - Partie de guidage d'échappement de turbocompresseur avec une aube de buse - Google Patents

Partie de guidage d'échappement de turbocompresseur avec une aube de buse Download PDF

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Publication number
EP2138598B1
EP2138598B1 EP08752081.3A EP08752081A EP2138598B1 EP 2138598 B1 EP2138598 B1 EP 2138598B1 EP 08752081 A EP08752081 A EP 08752081A EP 2138598 B1 EP2138598 B1 EP 2138598B1
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Prior art keywords
steel
nozzle vane
exhaust guide
temperature
amount
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EP08752081.3A
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German (de)
English (en)
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EP2138598A4 (fr
EP2138598A1 (fr
Inventor
Sadayuki Nakamura
Manabu Oku
Yoshiaki Hori
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Nippon Steel Stainless Steel Corp
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Nippon Steel Stainless Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/165—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/007—Preventing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers

Definitions

  • the present invention relates to an exhaust guide member to constitute the nozzle vane of a turbocharger equipped with a nozzle vane, which is to change the speed of exhaust gas running through a turbine in accordance with the speed of engine revolution, and the member constitutes an exhaust guide for guiding exhaust gas to the turbine.
  • turbocharger As a turbocharger, well known are a wastegate-type one and a nozzle vane-type one.
  • the wastegate-type turbocharger is mainly for improving engine power; but the nozzle vane-type turbocharger contributes not only toward power improvement but also toward exhaust gas clarification, and recently, in particular, it has become mounted also on diesel engines.
  • the member that constitutes the latter nozzle vane and constitutes an exhaust guide for guiding exhaust gas to a turbine is manufactured mainly by the use of a stainless steel plate, for example, a heat-resistant steel plate of SUS310S or the like.
  • JP 2002 332 862 A describes an invention of manufacturing such an exhaust guide assembly with a high-chromium high-nickel material through precision casting and machining.
  • Fig. 1 shows an exploded view of one embodiment of members that constitute an exhaust guide of a nozzle vane-type turbocharger.
  • members that constitute an exhaust guide of a nozzle vane-type turbocharger.
  • These are a drive ring 1, a drive lever 2, an intermediate nozzle ring 3, a nozzle vane 4 and an outer nozzle ring 5; and the nozzle vane 4 comprises plural vanes 6 to constitute it and vane shafts 7 to support the respective vanes 6.
  • These members 1 to 5 are concentrically assembled and set on the upstream side of the turbine of a turbocharger; and the assembly forms an exhaust guide that guides an exhaust gas to the turbine of a turbocharger through the center opening 8 of the nozzle vane 4.
  • the shafts 7 of the respective vanes 6 of the nozzle vane 4 rotate all in the same direction; and in accordance with the degree of the rotation, the open area (aperture) of the center opening 8 surrounded by the vanes 6 is increased and decreased.
  • the open area of the center opening 8 is narrow ; but when the speed of engine revolution is increased and the displacement is thereby increased, then the member is driven to broaden the open area.
  • the case having such a nozzle vane is so driven that the speed of the exhaust gas to be led into a turbine is varied in accordance with the speed of engine revolution, or that is, the exhaust gas speed is increased when the speed of engine revolution is low but is lowered when it is high, as compared with a case not having the nozzle vane.
  • These members are for accurately controlling the aperture of the nozzle vane, working with an actuator; and in general, these are manufactured by blanking with a press, and are required to satisfy fine blanking capability (precision blanking workability) such that the blanked faces could be all shear faces.
  • fine blanking capability precision blanking workability
  • the temperature may increase up to about 500°C, and therefore their high-temperature strength in a middle temperature range is important.
  • the outer nozzle ring 5 has a part of ring forging (burring) into a shape that corresponds to the shape of a turbine, in the center opening. Accordingly, these are required to have good machinability and press-formability. These are members serving also for guiding exhaust gas, and are therefore required to keep good high-temperature strength and oxidation resistance even though exposed to high temperatures of about 800°C.
  • the nozzle vane 4 is for controlling the open area of an exhaust gas route. Therefore, this is all the time exposed to the exhaust gas running through it, and is exposed to the highest temperature (800 to 900°C) among the members. Accordingly, this is required to have high-temperature strength enough to resist the pulsating pressure of exhaust gas and to have high-temperature oxidation resistance for smooth driving even at high temperatures. Because of those necessary characteristics, heat-resistant steel plates of SUS310S or the like are generally used for it, but SUS310S steel plates have poor workability.
  • the necessary material characteristics of exhaust guide members of nozzle vane-type turbochargers individually differ for the respective members, and therefore, in general, different steel materials are used for the individual members and different processes are employed individually for them.
  • the members formed of different materials are assembled into a nozzle vane-having exhaust guide assembly, then the difference in the thermal expansion coefficient between the members and the difference in the degree of the formed oxidation scale therebetween may interfere with smooth aperture control of the open area in the exhaust gas route that is the intrinsic function of the nozzle vane-type turbocharger.
  • This problem could be solved when all the exhaust guide members are formed of the same material (steel of the same type) ; however, a material capable of simultaneously and sufficiently satisfying the above-mentioned, individually different characteristics is unknown. Accordingly, at present, the respective members are formed of different materials that individually satisfy the respective necessary characteristics.
  • JP 2002 332 862 A describes an invention for manufacturing an exhaust guide assembly of turbocharger according to a lost wax casting method of using a special high-chromium high-nickel heat-resistant steel that contains Pb, Se and Te.
  • the main machining comprises cutting and polishing, and therefore, steel shaping may be omitted and the problem of shapability necessary for steel may be evaded therein.
  • the steel contains special additive elements and precision casting is employed for it, and therefore this requires a special manufacture process inevitably with poor producibility and cost increase, as compared with a case of manufacturing exhaust guides in an ordinary production line.
  • JP 6 10 114 A JP 2002 332 857 A discloses an exhaust guide assembly for a VGS (Variable Geometry System) turbocharger applied with surface modification having improved high-temperature wear resistance, oxidation resistance, and hot hardness at elevated temperatures.
  • a constituent member of the exhaust guide assembly includes a variable blade, a turbine frame or a varying mechanism.
  • US 4 530 720 A discloses a high temperature oxidation resistant austenitic steel having improved resistance to oxidation at the high temperature, comprising not more than 0.10% of C, 0.1-5.0% of Si, not more than 3% of Mn, 7-45% of Ni, 15-30% of Cr and sulfur content being restricted to not more than 0.003%.
  • the sulfur content is limited to not more than 0.003% in order to accomplish an improved resistance to oxidation under severe conditions including repeated heating to high temperatures and cooling to room temperature.
  • JP S53 149 114 A discloses a stainless steel resistant to corrosion by an engine exhaust gas consisting of, by wt.%, not more than 0.05% of C, not more than 1.5% of Mn, 8-12% of Ni, 17-20% of Cr, 1.5-3.5% of Si, and 19-22% of sum of Cr and Si, with a balance of Fe and inevitable impurities.
  • An object of the present invention is to solve the above-mentioned problems and to make it possible to produce an exhaust guide member of turbocharger having good high-temperature oxidation resistance and high-temperature strength from a stainless steel plate of the same type with good producibility, therefore providing an exhaust guide member inexpensive and excellent in durability.
  • an exhaust guide member of a nozzle vane-type turbocharger equipped with a nozzle vane for changing the speed of exhaust gas running through a turbine in accordance with the speed of engine revolution as set forth in claim 1. Further embodiments are inter alia disclosed in the dependent claims.
  • the austenite stainless steel may contain one or two of Nb and Ti in a total amount of from 0.05 to 1.0 % by mass, one or two of Mo and Cu in a total amount of from 0.50 to 5.0 % by mass, and one or two of REM (rare earth element including Y) and Ca in a total amount of from 0.01 to 0.20 % by mass.
  • the exhaust guide member according to the invention may be at least one of the drive ring, the drive lever, the nozzle ring, and the vane and its shaft of the nozzle vane illustrated in Fig. 1 .
  • the exhaust guide member of a nozzle vane-type turbocharger of the invention may be produced not requiring any special production method and treatment, and its high-temperature oxidation resistance is good, and its high-temperature strength and high-temperature slidability (high-temperature abrasion resistance) are also good.
  • Fig. 1 is an exploded view showing an exhaust guide of a turbocharger, as exploded into the members constituting it.
  • the exhaust guide member of a nozzle vane-type turbocharger is required to have the above-mentioned characteristics; and in short, the part to be in contact with exhaust gas is required to have heat resisting properties such as high-temperature strength and respective members are required to have the following individual characteristics in accordance with their functions.
  • the nozzle ring must have suitable work-hardening characteristics for keeping the necessary hole-expanding workability.
  • the vanes of the nozzle vane must have excellent ductility as they are cold-forged to have a wing-like shape.
  • the drive ring and the drive lever must have good slidability at high temperatures.
  • a meta-stable austenite stainless steel such as typically SUS304 may form work-induced martensite in the worked face, when worked by blanking; and when it is thereafter worked by hole-expanding or the like, then it may be often cracked starting from the blanked edge thereof. Accordingly, its workability (burring capability) after blanking is poor.
  • a stable austenite such as typically SUS310S does not form work-induced martensite during transformation, and therefore, as compared with the above-mentioned meta-stable austenite steel, its burring capability is excellent but its uniform elongation is poor. Accordingly, it could not have excellent hole-expanding capability.
  • the present inventors have made various tests and investigations for solving these problems.
  • Si when Si is added to a stable austenite stainless steel in an amount of from 2.0 to 4.0 % by mass, then the softness of the material may be kept as such and the material may have suitable work-hardening characteristics, and further, its elongation may increase and its hole-expanding efficiency may also increase, and therefore it is suitable to production of exhaust guide members.
  • the main reason is that addition of a suitable amount of Si may lower stacking fault energy and therefore the work-hardening index of the stable austenite stainless steel may also increase.
  • the Si addition may improve the slidability at high temperatures of drive rings and drive levers. This is because the Si-added steel produces little oxidation scale at high temperatures, and even though produced, the scale has excellent peeling resistance therefore causing little scale peeling and abrasion by sliding, and the steel may keep excellent high-temperature slidability.
  • the DE value of the following formula may fall within a range of from 5.0 to 12.0, and the steel can thereby keep good hot workability.
  • the present invention has been made on the basis of these findings, and it has made it possible to produce an exhaust guide member of a turbocharger having good high-temperature oxidation resistance and high-temperature strength from a steel of the same type with good producibility so as to satisfy at the same time the material characteristics necessary for the individual members.
  • the present invention is characterized in that it has clarified the constitutive ingredient composition of steel having the property applicable to all of exhaust guide members. The summary of the reasons for the definition of the content of each constitutive ingredient of steel is described below.
  • C is an austenite-forming element, and increases the high-temperature strength of steel.
  • a carbide may be often formed in a high-temperature range in the environment; and when a carbide is formed, the high-temperature strength of the steel may lower.
  • the C amount is at most 0.08 % by mass, preferably at most 0.06 % by mass.
  • Si is a steel ingredient that plays an important role in the invention, as so mentioned in the above; and addition of Si to steel improves the hole-expanding capability and the high-temperature oxidation resistance of steel. For this, addition of at least 2.0 % by mass is necessary; however, excessive addition may detract from the stability of austenite phase and may rather worsen the workability of steel. Accordingly, the Si amount is from 2.0 to 4.0 % by mass.
  • the Mn content is at most 2.0 % by mass.
  • Ni is an element that stabilizes an austenite phase; and accordingly, it is incorporated in an amount of at least 8.0 % by mass. However, it is expensive and when added too much, it may lower the ⁇ -ferrite amount that is necessary in some degree; and therefore, the Ni amount is from 8.0 to 16.0 % by mass.
  • the Cr stabilizes the oxidation resistance at high temperatures, and must be incorporated in an amount of at least 18.0 % by mass. However, when added too much, then it may detract from the producibility and may excessively increase the ⁇ -ferrite amount. Accordingly, the Cr amount is from 18.0 to 20.0 % by mass.
  • Ti and Nb both fix C and N in steel as carbonitrides, and the carbonitrides finely disperse and precipitate in steel to thereby increase the high-temperature strength of steel; however, when Ti and Nb are added excessively, then they may detract from the hot workability and the surface quality characteristics of steel. Accordingly, one or two of these elements are incorporated preferably in an amount of from 0.05 to 1.0 % by mass in total.
  • Mo and Cu improve the high-temperature strength and the oxidation resistance in high-temperature wet condition of steel; however, excessive addition thereof may detract from the hot workability of steel. Accordingly, one or two of Mo and Cu are incorporated preferably in an amount of from 0.50 to 5.0 % by mass in total.
  • REM rare earth element including Y
  • Ca have an effect of inhibiting intergranular oxidation at high temperatures and thereby improving the peeling resistance of oxidation scale; however, too much addition thereof may detract from the hot workability of steel. Accordingly, one or two of REM and Ca are incorporated preferably in an amount of from 0.01 to 0.20 % by mass in total.
  • the ingredients of the steel in the invention are so controlled that they satisfy the DE value of the above-mentioned formula to fall from 5.0 to 12.0. Having the thus-controlled DE value to fall within the above range, the steel may keep good hot workability even though Si is added thereto.
  • ingredient control is effective for forming a small amount of a ⁇ -ferrite phase at a hot-rolling temperature.
  • the present inventors have found that, when the DE value is from 5.0 to 12.0, then the steel in the invention that has a tendency of promoting ⁇ -ferrite phase formation by Si addition thereto may keep good hot workability, as shown in Examples given hereinunder.
  • one characteristic feature of the invention is that suitable Si addition and suitable DE value range selection can make it possible to produce a steel having the necessary severe characteristics all at a time for exhaust guide members with good producibility.
  • Table 1 shows the data of the chemical ingredients and the DE value of steel samples prepared herein. These were produced by vacuum melting of 30 kg of steel; and the produced steel ingots were all forged into ⁇ 15 mm columnar rods and plates having a thickness of 30 mm. The obtained columnar rods were processed for solution treatment at 1100°C. The obtained forged plates were hot-rolled into plates having a thickness of 4 mm; and two types of test steel plates were formed of those hot-rolled plates. One of the hot-rolled plates was annealed and then cold-rolled to a thickness of 1.5 mm, and finally annealed to be a cold-rolled annealed plate.
  • the hot-rolling condition and the annealing condition were as follows: The hot-rolling temperature was 1200°C; the annealing of the hot-rolled plate was at 1100°C ⁇ soaking for 60 seconds; and the final annealing was at 1100°C ⁇ soaking for 30 seconds.
  • the other hot-rolled plate was annealed under the same condition as above, and then its surface was cut to a thickness of 3 mm, thereby preparing a hot-rolled cut plate having a thickness of 3 mm.
  • A1 to A10 having a DE value of from 5 to 12 all have a large cross section area reduction ratio under hot tension and a large hole expanding ratio at room temperature, though having an Si content of from 2.0 to 4.0 % by mass, and their high-temperature tensile strength and high-temperature oxidation resistance are both good, and their high-temperature slidability is also good (their high-temperature abrasion amount is small). Accordingly, they satisfy all the material characteristics necessary for all the members constituting an exhaust guide, and their producibility and shapability are also good. Therefore, even when all the constitutive members are formed of the steel of the same type, an exhaust guide assembly capable of satisfying all the necessary characteristics can be produced.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)
  • Control Of Turbines (AREA)

Claims (2)

  1. Élément de guidage d'échappement d'un turbocompresseur du type à aube de buse équipé d'une aube de buse pour modifier la vitesse des gaz d'échappement passant à travers une turbine en fonction de la vitesse de rotation du moteur, dans lequel l'élément destiné à constituer l'aube de buse et à constituer un guide d'échappement pour guider les gaz d'échappement vers la turbine est formé en un acier inoxydable austénitique contenant, en % en masse, au plus 0,08 % de C, de 2,0 à 4,0 % de Si, au plus 2,0 % de Mn, de 8,0 à 16,0 % de Ni, de 18,0 à 20,0 % de Cr, au plus 0,04 % de N et optionnellement l'un ou les deux de Nb et de Ti dans une quantité comprise entre 0,05 et 1,0 %, l'un ou les deux de Mo et de Cu dans une quantité comprise entre 0,50 et 5,0 % et l'un ou les deux de REM (élément de terre rare comprenant Y) et de Ca dans une quantité comprise entre 0,01 et 0,20 %, l'acier inoxydable austénitique contenant ces ingrédients de telle manière qu'ils satisfont une valeur DE la formule suivante comprise entre 5,0 et 12,0, le reste étant constitué de Fe et d'inévitables impuretés : Valeur DE = Cr + 1,5 ⁢ Si + 0,5 ⁢ Nb + Mo − Ni − 0,3 ⁢ Cu − 0,5 ⁢ Mn − 30 C + N .
    Figure imgb0005
  2. Élément de guidage d'échappement d'un turbocompresseur du type à aube de buse selon la revendication 1, dans lequel l'élément de guidage d'échappement comprend une bague de commande, un levier de commande, une bague de buse, et l'aube et son arbre d'une aube de buse.
EP08752081.3A 2007-04-19 2008-04-18 Partie de guidage d'échappement de turbocompresseur avec une aube de buse Active EP2138598B1 (fr)

Applications Claiming Priority (2)

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JP2007110139 2007-04-19
PCT/JP2008/058002 WO2008133320A1 (fr) 2007-04-19 2008-04-18 Partie de guidage d'échappement de turbocompresseur avec une aube de buse

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EP2138598A1 EP2138598A1 (fr) 2009-12-30
EP2138598A4 EP2138598A4 (fr) 2017-02-15
EP2138598B1 true EP2138598B1 (fr) 2020-04-15

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US (1) US8206091B2 (fr)
EP (1) EP2138598B1 (fr)
JP (1) JP4937277B2 (fr)
KR (1) KR101473204B1 (fr)
CN (1) CN101542000B (fr)
ES (1) ES2788077T3 (fr)
WO (1) WO2008133320A1 (fr)

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JP5605218B2 (ja) * 2010-12-28 2014-10-15 トヨタ自動車株式会社 駆動リングの製造方法、駆動リング、および駆動リングを用いた可変ノズル機構
KR20140033080A (ko) * 2011-05-19 2014-03-17 보르그워너 인코퍼레이티드 오스테나이트 철계 합금, 상기 철계 합금으로 이루어진 터보차저 및 구성요소
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CN101542000A (zh) 2009-09-23
JPWO2008133320A1 (ja) 2010-07-29
US20100068040A1 (en) 2010-03-18
KR101473204B1 (ko) 2014-12-16
EP2138598A4 (fr) 2017-02-15
WO2008133320A1 (fr) 2008-11-06
JP4937277B2 (ja) 2012-05-23
ES2788077T3 (es) 2020-10-20
EP2138598A1 (fr) 2009-12-30
US8206091B2 (en) 2012-06-26
CN101542000B (zh) 2012-04-04
KR20090128314A (ko) 2009-12-15

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